In spite of its shortcomings, the Bohr model of the atom is useful in explaining these properties. Classically, an electron in a circular orbit of radius r, about a hydrogen nucleus of charge +e, ...

A hydrogen-like atom/ion (usually called ... certain exotic atoms (formed with other particles), or Rydberg atoms (in which one electron is in such a high energy state that it sees the rest of the ...

It came when the one electron of the hydrogen atom transitioned from the 2P ... In particular, this reduces the value of the Rydberg constant by one part in a trillion. Introduced by the Swedish ...